新增: 文件操作增强与预览扩展
- 文件剪贴板复制剪切粘贴，重名自动副本 - SFTP下载到本机与外部文件拖入，目录递归 - 传输进度浮动面板，transfer-progress事件链 - Drawio预览，Excel工作线程，冻结看门狗 - cmd与bat自写batch语法高亮，psm1等映射补齐
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package filesystem
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import (
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"archive/zip"
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"fmt"
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"io"
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"log"
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"net/http"
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"os"
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"path/filepath"
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"strings"
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"sync"
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"time"
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"u-desk/internal/common"
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"u-desk/internal/service"
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)
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// drawio viewer 运行时下载缓存方案:
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// 首次预览 .drawio 时,从自建下载源拉取 drawio webapp zip → 解压到 ~/.u-desk/drawio-viewer/
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// → 文件服务器 /drawio-viewer/ 从缓存目录托管静态资源 → 之后离线可用。
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// 升级 drawio 时:改下面的版本号 + URL + SHA256。
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const (
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drawioViewerVersion = "30.3.8" // drawio 版本,升级时改这里
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drawioViewerZipURL = "https://c.1216.top/u-desk/drawio-viewer-30.3.8.war" // 自建下载源(draw.war 解压即 webapp)
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drawioViewerSHA256 = "e12a3e190adda7c1486572bd28c1af9fffbe932df2efead3c9aa8347862505da" // draw.war v30.3.8 SHA256
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drawioViewerDirName = "drawio-viewer"
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versionFileName = "VERSION"
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)
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// 并发保护:多个 .drawio 同时打开时只下载一次,其余等待
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var (
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drawioEnsureMu sync.Mutex
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drawioEnsuring bool
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)
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// DrawioViewerVersion 返回当前配置的 viewer 版本(供 binding 返回前端)
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func DrawioViewerVersion() string { return drawioViewerVersion }
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// drawioCacheDir 缓存目录 ~/.u-desk/drawio-viewer/
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func drawioCacheDir() string {
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return filepath.Join(common.GetUserDataDir(), drawioViewerDirName)
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}
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// isDrawioViewerReady 缓存目录存在且 VERSION 文件匹配当前版本
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func isDrawioViewerReady() bool {
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data, err := os.ReadFile(filepath.Join(drawioCacheDir(), versionFileName))
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if err != nil {
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return false
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}
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return strings.TrimSpace(string(data)) == drawioViewerVersion
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}
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// EnsureDrawioViewer 确保本地已缓存 drawio viewer。未就绪则下载 zip + 解压。
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// progress 回调推送下载进度(可为 nil)。并发安全:同时调用只下载一次,其余等待。
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func EnsureDrawioViewer(progress service.DownloadProgress) error {
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if isDrawioViewerReady() {
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return nil
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}
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// 并发保护:已有线程在下载 → 轮询等待就绪
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drawioEnsureMu.Lock()
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if drawioEnsuring {
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drawioEnsureMu.Unlock()
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for i := 0; i < 3600; i++ { // 最多等待 30 分钟(与下载超时对齐)
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if isDrawioViewerReady() {
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return nil
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}
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time.Sleep(500 * time.Millisecond)
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}
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return fmt.Errorf("等待 drawio viewer 下载超时")
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}
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drawioEnsuring = true
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drawioEnsureMu.Unlock()
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defer func() {
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drawioEnsureMu.Lock()
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drawioEnsuring = false
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drawioEnsureMu.Unlock()
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}()
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cacheDir := drawioCacheDir()
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// 1. 下载 zip(复用 service.DownloadUpdate,自带断点续传 + 哈希)
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res, err := service.DownloadUpdate(drawioViewerZipURL, progress)
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if err != nil {
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return fmt.Errorf("下载 drawio viewer 失败: %w", err)
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}
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// 2. SHA256 校验(若常量非空)。DownloadUpdate 成功时必返回 SHA256Hash
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if drawioViewerSHA256 != "" {
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if !strings.EqualFold(res.SHA256Hash, drawioViewerSHA256) {
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_ = os.Remove(res.FilePath) // 删除损坏文件,下次重试
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return fmt.Errorf("drawio viewer 哈希校验失败: 期望 %s, 实际 %s", drawioViewerSHA256, res.SHA256Hash)
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}
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}
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// 3. 解压到临时目录,成功后原子替换缓存目录(避免半解压状态)
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tmpDir := cacheDir + ".tmp-" + drawioViewerVersion
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_ = os.RemoveAll(tmpDir)
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if err := unzipToDir(res.FilePath, tmpDir); err != nil {
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_ = os.RemoveAll(tmpDir)
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return fmt.Errorf("解压 drawio viewer 失败: %w", err)
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}
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// 4. 写 VERSION 文件
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if err := os.WriteFile(filepath.Join(tmpDir, versionFileName), []byte(drawioViewerVersion), 0644); err != nil {
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_ = os.RemoveAll(tmpDir)
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return fmt.Errorf("写入 VERSION 失败: %w", err)
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}
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// 5. 原子替换缓存目录
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_ = os.RemoveAll(cacheDir)
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if err := os.Rename(tmpDir, cacheDir); err != nil {
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_ = os.RemoveAll(tmpDir)
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return fmt.Errorf("移动 drawio viewer 到缓存目录失败: %w", err)
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}
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// 安装成功后删除下载的 war 包，避免长期占用磁盘（失败路径保留以支持断点续传）
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_ = os.Remove(res.FilePath)
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log.Printf("[DrawioViewer] 缓存就绪: %s (版本 %s)", cacheDir, drawioViewerVersion)
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return nil
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}
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// handleDrawioViewerRequest /drawio-viewer/* → 从缓存目录读静态资源(绕过文件类型白名单)
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// viewer 资源含 .woff2/.stencil 等白名单外扩展名,故独立路由,不走 handleLocalFileRequest。
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func handleDrawioViewerRequest(w http.ResponseWriter, r *http.Request) {
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if writeCORSHeaders(w, r) || ensureGetMethod(w, r) {
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return
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}
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if !isDrawioViewerReady() {
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http.Error(w, "drawio viewer not ready, please call EnsureDrawioViewer first", http.StatusServiceUnavailable)
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return
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}
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// 剥离 /drawio-viewer/ 前缀
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subPath := strings.TrimPrefix(r.URL.Path, "/drawio-viewer/")
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if subPath == "" {
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subPath = "index.html"
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}
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// 路径清理 + 防遍历:限制在缓存目录内
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cleanPath, ok := sanitizeSubPath(subPath)
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if !ok {
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http.Error(w, "Forbidden", http.StatusForbidden)
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return
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}
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if cleanPath == "." || cleanPath == "" {
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cleanPath = "index.html"
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}
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absPath, ok := joinWithinBase(drawioCacheDir(), cleanPath)
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if !ok {
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http.Error(w, "Forbidden", http.StatusForbidden)
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return
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}
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data, err := os.ReadFile(absPath)
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if err != nil {
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http.NotFound(w, r)
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return
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}
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w.Header().Set("Content-Type", getDrawioViewerMIME(filepath.Ext(cleanPath)))
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if cleanPath == "index.html" {
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w.Header().Set("Cache-Control", "no-cache") // 入口短缓存,便于升级
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} else {
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w.Header().Set("Cache-Control", "public, max-age=86400")
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}
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w.Write(data)
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}
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// sanitizeSubPath 将子路径(URL 或 zip 条目名)清理为正斜杠相对路径,含 .. 视为可疑,返回 false
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func sanitizeSubPath(sub string) (string, bool) {
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cleaned := strings.TrimPrefix(filepath.ToSlash(filepath.Clean("/"+sub)), "/")
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if strings.Contains(cleaned, "..") {
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return "", false
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}
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return cleaned, true
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}
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// joinWithinBase 将相对路径拼进 base 并确认结果仍在 base 内(防符号链接绕过),越界返回 false
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func joinWithinBase(base, sub string) (string, bool) {
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absPath := filepath.Join(base, filepath.FromSlash(sub))
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if rel, err := filepath.Rel(base, absPath); err != nil || strings.HasPrefix(rel, "..") {
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return "", false
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}
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return absPath, true
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}
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// getDrawioViewerMIME 返回 viewer 静态资源的 MIME
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func getDrawioViewerMIME(ext string) string {
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switch strings.ToLower(ext) {
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case ".html", ".htm":
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return "text/html; charset=utf-8"
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case ".js", ".mjs":
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return "application/javascript; charset=utf-8"
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case ".css":
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return "text/css; charset=utf-8"
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case ".json":
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return "application/json"
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case ".svg":
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return "image/svg+xml"
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case ".png":
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return "image/png"
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case ".gif":
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return "image/gif"
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case ".jpg", ".jpeg":
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return "image/jpeg"
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case ".woff":
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return "font/woff"
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case ".woff2":
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return "font/woff2"
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case ".ttf":
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return "font/ttf"
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case ".xml":
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return "application/xml"
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default:
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return "application/octet-stream"
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}
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}
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// ==================== 辅助函数 ====================
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// unzipToDir 解压整个 zip 到目标目录(覆盖已存在文件)
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func unzipToDir(zipPath, destDir string) error {
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r, err := zip.OpenReader(zipPath)
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if err != nil {
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return err
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}
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defer r.Close()
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if err := os.MkdirAll(destDir, 0755); err != nil {
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return err
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}
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for _, f := range r.File {
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if err := extractZipFile(f, destDir); err != nil {
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return err
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}
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}
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return nil
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}
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// extractZipFile 解压单个 zip 条目到目标目录(带路径遍历防护)
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func extractZipFile(f *zip.File, destDir string) error {
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name, ok := sanitizeSubPath(f.Name)
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if !ok {
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return fmt.Errorf("可疑路径: %s", f.Name)
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}
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destPath, ok := joinWithinBase(destDir, name)
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if !ok {
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return fmt.Errorf("逃逸路径: %s", f.Name)
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}
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if f.FileInfo().IsDir() {
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return os.MkdirAll(destPath, 0755)
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}
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if err := os.MkdirAll(filepath.Dir(destPath), 0755); err != nil {
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return err
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}
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rc, err := f.Open()
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if err != nil {
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return err
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}
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defer rc.Close()
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out, err := os.OpenFile(destPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
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if err != nil {
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return err
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}
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defer out.Close()
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_, err = io.Copy(out, rc)
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return err
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}
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